The basic reason she was refused was that the officer thinks she will overstay her visa and not return to Thailand. I can understand this as there is many illegal immigrants in Australia. All that they require to allow the visa is to show that Lapin has strong ties in Thailand which will compel her to return to Thailand after her holiday. In your application you have made no explanation to show any ties at all, nothing about recently purchased real estate, a dependant daughter still at school and you have demeaned her employment.
I have a very good understanding of legal documents and I have no trouble interpreting their meaning I also have a good understanding of the legislation, it is only because of the laws concerning the use of a registered visa agent that I can not help her myself. From this I can see that you have put very little effort or thought into this application and I do not consider that we have been given the professional service for which we have been charged.
I would request that you consider giving a refund for the services we have been charged for that have not been supplied to a satisfactory standard, or, pass this case on to someone in your firm who has a more detailed knowledge and experience and can perform the service in a more suitable manner. I think that what you have submitted has probably done more damage than good. We are not willing to wait as the opportunity to obtain a Tourist visa is not going to improve with time, it will only improve with a properly and professional made application.
I will wait to hear from your firms manager or someone more senior and experienced.